CVE-2013-4207 Memory corruption in n/a

Medium 4.3 Published 19 Aug 2013 Updated 6 Aug 2024

A remote SSH server can crash the PuTTY client by sending a malformed DSA signature, causing a buffer overflow during modular inverse computation.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2013-4207?

CVE-2013-4207 is a medium-severity memory corruption vulnerability in n/a, published on 19 Aug 2013. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Buffer overflow in sshbn.c in PuTTY before 0.63 allows remote SSH servers to cause a denial of service (crash) via an invalid DSA signature that is not properly handled during computation of a modular inverse and triggers the overflow during a division by zero by the bignum functionality, a different vulnerability than CVE-2013-4206.

Weakness: CWE-119

Which versions are affected by CVE-2013-4207?

It affects 2 products.

Products include Putty Putty, Simon Tatham Putty.

How do I fix CVE-2013-4207?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2013-4207 being exploited?

There is no known exploitation of CVE-2013-4207 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2013-4207, GHSA-gqcg-rpgj-92fp.